Introduction

While originally DEP-11 was a Debian-specific project to increase metadata provided
by packages in Debian, most of its original ideas have been moved upstream into the
AppStream project and are now implemented by AppStream itself.

So, by now (2015) it is safe to say that DEP-11 is the implementation of AppStream for the
Debian archive, providing a large amount of machine-upstream metadata to our users and
clients like GNOME Software and KDE Discover.

All recent information is provided in the AppStream documentation
at Freedesktop, which contains all information needed for upstream projects (or in exceptions, packagers) to write the necessary
metadata, as well as details on how it is shipped.
The YAML implementation of the AppStream collection metadata format, also known as DEP-11, i
documented there as well.

The source-code of AppStream (the client tool and parser) can be found on Github.